Dimensioning is one of the main activities performed in the technical documentation of parts. To illustrate, here is an example.

The dimensioning of the edges is somewhat problematic, which are located “deeper” and are covered by the longer edge that is closer.

Of course, these are several options, e.g. ability to hide parts/objects. You can use filtering – this is another method. You can finally rotate the model in 3D to reveal the correct edge.
You can not insert the midline? Find out how to get around this
But did you know, that you can hold down the SHIFT key while dimensioning to get to an edge covered by another edge.
